Structural Modifications between Lithium-Diborate Glasses and Melts: Implications for Transport Properties and Melt Fragility. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry B Année : 2003

Structural Modifications between Lithium-Diborate Glasses and Melts: Implications for Transport Properties and Melt Fragility.

Résumé

The effect of temperature on the alkali environment in melts and in glasses has been investigated in Lithium diborate system by neutron diffraction with isotopic substitution of Li. In situ high-temperature measurements have been performed in glassy and liquid states (1273 K), by use of a vanadium furnace. A well-defined environment extends up to 4 Å around Li in the glass as well as in the melt. However, several structural differences are observed between the melt and the glass. The mean Li-O distance is shortened by -0.02 Å in the melt, and the distribution of Li-B correlations is reduced in width and intensity. As the structure of the glass at 300 K retains that of the melt quenched at Tg, the present neutron diffraction data indicate a continuous reorganization process between the supercooled melt and the liquid state. These temperatureinduced structural changes are related to the increased modifying role of Li in diborate melt. Together with the boron coordination change, these modifications imply a non-Arrhenian behavior in transport properties such as ionic diffusion and melt fragility.

Dates et versions

hal-00085102 , version 1 (11-07-2006)

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Odile Majérus, Laurent Cormier, Georges Calas, Brigitte Beuneu. Structural Modifications between Lithium-Diborate Glasses and Melts: Implications for Transport Properties and Melt Fragility.. Journal of Physical Chemistry B, 2003, 47, pp.13044-13050. ⟨10.1021/jp0359945⟩. ⟨hal-00085102⟩
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